The open-source Modelica library TransiEnt Library was developed within the research project TransiEnt.EE. This paper presents two major library extensions which were developed in the follow-up research project ResiliEntEE. Modeling of the power sector on transmission grid level is now possible due to the implementation of the complex bus voltage. In the gas sector, the efficiency of mass and energy balance computation was improved. Furthermore, an efficient physical pressure loss model was added leading to more realistic results and faster simulations. One possible application of the library is presented in an exemplary simulation of an integrated energy system. It is shown that the dynamic simulation allows the representation of disturbances and their possible consequences in coupled sectors. Thus, next to cost and CO2 emissions, an integrated energy system can be assessed in terms of its resilience as well.
Since the 1980s, the term "resilience" occurs more and more frequently in energy system analysis. However, the consideration and definition of the term primarily occurs in a qualitative way. This papers introduces a quantitative method to assess an energy system's resilience by using physical key figures to reflect the maintained functionality during and after a disturbance. The presented method is used to evaluate the resilience of a heating system of a single family dwelling when its pump or boiler fails. It can be shown that the introduced resilience index mirrors the drop of the system's functionality and is also able to point out weak spots and the most efficient system improvements. This provides the foundation of comparing the resilience of complex systems even though it is important to pay attention to comparable assessment settings.
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